Know the usual distinction
Canker sores generally occur inside the mouth and are not contagious. Cold sores commonly appear around the lips as blisters and are associated with herpes simplex infection, which can spread between people. Not every sore follows a textbook pattern. Tell your clinician where it started, whether it recurs, and whether there was tingling, injury, or illness before it appeared.
Protect comfort and reduce irritation
Choose foods and drinks that do not sting the affected area, and keep cleaning the surrounding teeth gently. Avoid picking a lesion or repeatedly testing it with your tongue. If you suspect a cold sore, avoid kissing and sharing items that contact the mouth while it is active. Let the dental office know before a planned visit so the team can advise you.
Have persistent or unusual sores assessed
Contact a dentist about a sore lasting a week or longer, repeated episodes, or difficulty eating and drinking. Seek earlier advice for significant pain, fever, or a weakened immune system. A professional examination can consider irritation, infection, and other causes; it cannot be replaced by self-treatment. Note the start date and any changes so you can give a clear history without guessing at the diagnosis.
GOOD QUESTIONS
A little more clarity.
Does every mouth sore need an antibiotic?
No. Causes vary, and antibiotics are not a routine solution for either canker sores or viral cold sores. A clinician can recommend symptom relief or targeted treatment after assessing the lesion.